Question

President Eisenhower believed in the domino theory, which states that
if an aggressor nation invades one country successfully, it will invade another.
if one country falls to communism, its neighbors are also likely to do so.
if the United States can defeat one communist country, it can defeat them all.
if one section of a country is taken over, the rest of the country will also fall.

Answer 1

The second statement. Eisenhower’s domino theory held that if one country fell to communism, neighboring countries were likely to follow (his 1954 “row of dominoes” remark about Southeast Asia).